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Journal Club Seminars

Contents

The Journal Club talks take place on Fridays from 12:00 - 1:00pm in SERF 383. Generally pizza and soda are served.

The Journal Club is crafted to be a very informal and friendly environment where graduate students can present talks on any subject of interest to them, be it a recent journal paper, their own research work, or any topic.

Everyone is welcome to attend.

If you are interested in giving a talk, please contact: Jung-Tsung Li

Past journal club talks are listed in the sidebar by year.

Upcoming Journal Club Seminars

FALL 2018


October 19, 2018

 "Suppressing cooling flows in massive galaxies with cosmic ray injection and turbulent stirring"

Kung-Yi Su (12:00-1:00)
Finishing Graduate Student
Caltech

 Reading list: <http://www.tapir.caltech.edu/~sheagk/galfresca2018/talks/kysu.pdf>

Abstract: The quenching "maintenance" and related "cooling flow" problems are important in galaxies from Milky Way mass through clusters. We investigate this in halos with masses ~1e12-1e14 solar mass, using non-cosmological high-resolution hydrodynamic simulations with the FIRE-2 (Feedback In Realistic Environments) stellar feedback model. We first focus on physics present without AGN, and show that various proposed "non-AGN" solution mechanisms in the literature, including Type Ia supernovae, shocked AGB winds, other forms of stellar feedback (e.g. cosmic rays from supernovae), magnetic fields, Spitzer-Braginskii conduction, or "morphological quenching" do not halt or substantially reduce cooling flows nor maintain "quenched" galaxies in this mass range. This all supports the idea that additional physics, e.g., AGN feedback, must be important in massive galaxies. We then test various AGN feedback toy models with different forms of energy input and ranges of coupling, exploring what scenario can possibly quench galaxy and suppress the cooling flows without resulting in halo properties that contradict observations. The test scenarios include momentum injection, turbulent stirring, thermal heating, and cosmic ray injection. We found that turbulent stirring confined within 100 kpc and cosmic ray injection can both maintain a stable, low-SFR halo for extended periods of time, because they provide non-thermal pressure form which can stably lower the core density and cooling rate. This can be much more efficient than heating up the gas thermally. We conclude that the enhancements of turbulence and cosmic ray energy are very important aspects of AGN feedback, and can be the dominant processes that quench the massive ellipticals.



October 26, 2018

NOTE: CASS Annual Sexual Harassment and Discrimination Training
@ Noon in SERF 383

 (In lieu of the CASS Journal Club Seminar)
Pizza & soda provided!

Helen Kaiser from the Office for the Prevention of Harassment & Discrimination (OPHD) will be the featured speaker. Everyone in CASS should attend, if possible.



November 2, 2018

David Spergel (12:00-1:00)
Professor
Princeton



November 9, 2018

Fred Adams (12:00-1:00)
Professor of Physics
University of Michigan



November 16, 2018

Dino Hsu (12:00-12:30)
Physics Graduate Student
UCSD-CASS
OPEN TIME SLOT (12:30-1:00)



November 23, 2018

NOTE: Journal Club Cancelled Today - Thanksgiving Day Holiday



November 30, 2018

Gene Leung (12:00-12:30)
Physics Graduate Student
UCSD-CASS
OPEN TIME SLOT (12:30-1:00)